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Inventories (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Inventory Items, Net Of Reserves Alternative [Abstract]    
Raw materials $ 95,162 $ 95,430
Work in progress 16,970 16,585
Finished goods 175,007 150,667
Total inventories $ 287,139 $ 262,682